Like many animals, adult male chimpanzees often compete for a limited number of mates. They fight other males as they strive for status that confers reproductive benefits and use aggression to coerce females to mate with them. Nevertheless, small-bodied, socially immature adolescent male chimpanzees, who cannot compete with older males for status nor intimidate females, father offspring. We investigated how they do so through a study of adolescent and young adult males at Ngogo in Kibale National Park, Uganda. Adolescent males mated with nulliparous females and reproduced primarily with these first-time mothers, who are not preferred as mating partners by older males. Two other factors, affiliation and aggression, also influenced mating success. Specifically, the strength of affiliative bonds that males formed with females and the amount of aggression males directed toward females predicted male mating success. The effect of male aggression toward females on mating success increased as males aged, especially when they directed it toward females with whom they shared affiliative bonds. These results mirror sexual coercion in humans, which occurs most often between males and females involved in close, affiliative relationships.
|Original language||English (US)|
|Journal||Proceedings of the Royal Society B: Biological Sciences|
|State||Published - Jan 13 2021|
- Pan troglodytes
- alternative mating tactics
- sexual coercion
ASJC Scopus subject areas
- Immunology and Microbiology(all)
- Biochemistry, Genetics and Molecular Biology(all)
- Environmental Science(all)
- Agricultural and Biological Sciences(all)
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Supplementary material from "The development of affiliative and coercive reproductive tactics in male chimpanzees"
Reddy, R. B. (Creator), Langergraber, K. (Creator), Sandel, A. A. (Creator), Vigilant, L. (Creator) & Mitani, J. C. (Creator), The Royal Society, 2020
Analysis Tables from The development of affiliative and coercive reproductive tactics in male chimpanzees
Reddy, R. B. (Creator), Langergraber, K. (Creator), Sandel, A. A. (Creator), Vigilant, L. (Creator) & Mitani, J. C. (Creator), figshare Academic Research System, 2020
Langergraber, K. (Contributor), Mitani, J. C. (Contributor), Vigilant, L. (Contributor), Sandel, A. A. (Contributor) & Reddy, R. B. (Contributor), figshare Academic Research System, Jan 1 2020